Steam collecting device especially for high pressure steam



March 8, 1938. o. METZNER STE AM COLLECTING DEVICE ESPECIALLY FOR HIGHPRESSURE STEAM Filed March 21, 1935 jwwziw:

0776 /7ef2 ner /5 Patented Mar. 8, 1938 UNITED STATES STEAM COLLECTINGDEVICE ESPECIALLY FOR HIGH PRESSURE STEAM Otto Metzner, Mahrisch-Ostrau,Czechoslovakia Application March 21, 1935, Serial No. 12,335 In GermanyMarch 21, 1934 7 Claims.

In steam plants in which the steam collecting pipes are formed as asimple indirect connection of the individual leads, the working offersdifiiculties inasmuch as when cutting out individual supply leads wholebranches of the collecting pipe can be thrown out of action and, as aresult of cooling, cannot be kept ready for immediate working. For thisreason ring pipes are frequently preferred, but with these the removalof the said difiiculties gives rise to other disadvantages.

The invention removes these difficulties in that the ends of thecollecting pipes constructed as simple direct connection of theindividual leads are connected with the supply or the withdrawal leadsby means of auxiliary leads of small diameter. In this way even thosebranches of the collecting pipes which are thrown out of action owing tothe shutting off of supply leads are traversed by a suitable auxiliaryflow of steam and are kept at the full working temperature, so that thecollecting pipe is always ready for operation throughout its wholelength, and supply leads which have been shut oil can be instantlyconnected again. In order to ensure that a sumcient flow of steam isattained through the branches in question of the collecting pipes theauxiliary leads are connected with the supply or withdrawal leadspreferably only at a place which is removed from their point ofattachment to the collecting pipe, or a very small throttling iseffected in the supply or withdrawal leads after leaving or entering theauxiliary leads. At the junction of the auxiliary leads with thewithdrawal leads preferably a nozzle-like slight con-, struction isprovided in the same, at the narrowest place of which the auxiliaryleads then open into the withdrawal leads.

In the accompanying drawing several forms of the invention are shown byway of example with reference to steam boiler plants.

In the plant according to Figure 1 five boilers l are connected to acollecting pipe 3 by means of leads 2, the said pipe 3 directlyconnecting together the five separate leads 2 in a simple pipe line. Twowithdrawal leads 4 lead from the collecting pipe 3 to the two turbines 5with the main stop valves 6.

If now in such a plant only one turbine and the two boilers nearest toit are in operation, then the whole of the remaining part of thecollecting pipe 3 has no steam passing through it and it cools down. Ifthen one of the other boilers is to partake in the driving, this cannotbe done immediately.

In order to avoid this drawback the ends of the collecting pipe 3 areconnected by means of an auxiliary lead E, which need have only a comeparatively very smalldiameter, to the withdrawal leads t, and thecollecting pipe 3 with the auxiliary lead l forms a ring, connectingconduits 8 leading from the auxiliary lead I to the withdrawal leads 4parallel to the latter. These auxiliary connecting conduits 8 open intothe withdrawal leads 4 only at a position which is removed from theopening of the same from the collecting pipe 3, and in fact only behindthe shutofi member 6, so that there is first a certain pressure fallbefore the auxiliary leads I and 8 enter the main pipes 3 and 4 and theflow through the auxiliary leads 'I and 8 is ensured. Small shutofimembers 9 are installed in the auxiliary connecting conduits 8. Thesecan serve for warming up the withdrawal leads 4 and the turbines 5 aswell as a by-pass valve for actuating the shut-ofi valves 6 in the mainpipes when setting the plant into operation.

Besides these shut-off members 9 in the auxiliary connecting conduits 8there are also closing members Ill in the auxiliary lead 1 lyingparallel to the collecting pipe 3 between the ends of the collectingpipe 3 and the auxiliary connecting conduits 8. These are constructed sothat even in the closed position they still allow a small quantity ofsteam to pass through.

In the case just described, therefore, there is a flow even in thebranch of the collecting pipe 3 which is not traversed by the main flowof steam, and the collecting pipe 3, therefore, is always at its fulltemperature throughout the whole extent. In that branch of the auxiliarylead 1 which adjoins the part of the collecting pipe 3 traversed by themain flow of steam, the valve I0 is then closed, but as a result thereis still a small flow in this part of the auxiliary lead I.

Figure 2 shows the same arrangement only with the difference that theauxiliary lead I connects the ends of the collecting pipe 3 not with thewithdrawal leads 4, but with the supply leads 2. Correspondingly, theauxiliary branch conduits 8 are branched off from the supply leads 2 ata place removed from the point of attachment of the same to thecollecting pipe 3 and in fact in front of the shut-01f members 6 in thesupply leads 2.

Figure 3 of the drawing shows a plant in which the boilers l arearranged in two series and the collecting pipe 3 has a horse-shoe shape.In this case auxiliary leads 1 are disposed parallel to the two shanksof the collecting pipe 3, said leads proceeding from the dead ends ofthe collecting 55 pipe 3 and opening into the withdrawal lead 4. In thewithdrawal lead 4 there is a nozzle-like slight construction II, and atthe narrowest part of the same the auxiliary leads 1 are attached to thewithdrawal lead 4. These places of attachment are arranged in front ofthe main shut-01f member 6. Of course the point of attachment may alsobe arranged behind the shut-ofi member 6, but then a shut-off memberwould have to be inserted again in the auxiliary connecting conduit. 7

v The arrangement according to the invention is particularlyadvantageous for high pressure lines and for lines for superheatedsteam.

What I claim is:

1. A steam collecting pipe system especially for high pressure steamplants comprising a steam collecting main, branch pipes for the supplyof the steam and at least one branch pipe for the withdrawal of thesteam, the steam collecting main forming a simple direct connection forthe individual supply and withdrawal branch pipes, and auxiliary leadsof smaller diameter than the collecting main connecting the ends of thelatter with at least one of the said branch pipes and forming rings withthe steam main.

2. A steam collecting pipe system especially for high pressure steamplants comprising a steam collecting main, a series of branch pipes forthe supply of the steam and another series of branch pipes for thewithdrawal of the steam, the steam collecting main forming a simpledirect connection for the individual supply and withdrawal branch pipes,and auxiliary leads of smaller diameter than the collecting mainconnecting the ends of the latter with one series of the said branchpipes and forming rings with the steam main.

3. A steam collecting pipe system according to claim 1 characterizedtherein that the connecting points of the auxiliary leads with thebranch pipes are positioned remote from the connecting points of thebranch pipes with the steam collecting main.

4. A steam collecting pipe system according to claim 1 characterized byshut-off members being inserted in the auxiliary leads and beingconstructed so as to allow a limited flow even in their closed state. 5.A steam collecting pipe system according to claim 1 characterized byvalves being capable of creating a slight throttling action beinginserted in the branch pipes between the connecting points of the latterwith the steam collecting main and with the auxiliary leads.

6. A steam collecting pipe system according to 'claim 1 characterized bystop valves being provided in the branch pipes and stop-valves beingprovided in the auxiliary leads, the latter serving at the same time asby-pass valves for the stopvalves in the branch pipes.

7. A steam collecting pipe system especially for high pressure steamplants comprising a steam collecting main, branch pipes for the supplyof the steam and at least one branch pipe for the Withdrawal of thesteam,, the steam collecting main forming a simple direct connection forthe individual supply and the withdrawal branch pipe and auxiliary leadsof smaller diameter than the collecting main connecting the ends of thelatter with the withdrawal branch pipe and forming rings with thesteammain, a nozzle like contracting device being inserted in the withdrawalbranch pipe, the auxiliary leads entering said contracting device at thepoint of its smallest cross-section.

O'I'I'O METZNER.

